Bemulos Roman Tower (Location)
A small Roman outpost in the mountains of Marmarica. This is one of the possible Centurion locations for the His Secret Service side quest.
The treasure is on the second floor, the captain likes to patrol between the watchtower and front gate, and there's an unguarded gap in the fence to the west.
Come in through the gap and you can just walk up the stairs unchallenged. Loot the red chest from inside the large room.
If you don't want to stick around, go the roof and snipe the captain. If he's no longer patrolling, check the campfire.
His death completes the location.